Burglar-alarm.



No. 754,391. PATENTRD MAR. s, 1904.

P. o. ROBINSON R J. R. GREEN. BURGLAR ALARM.

ABPLLU ATIQN FILED NOV, 26, 1901.

N0 MODEL..4

. /N VE N ORS FREEMAN C. Hoe/Ns oN JAMES E GREEN ATTORNE/.

W/TNESSES" VUNITED STATES Patented March s, 19o-1.

PATENT OFFICE'.

FREEMAN o. ROBINSON. AND JAMES-E. GREEN, or COUNCIL BLUEEs, iowa.

BU nGLA-ALARM.

SPEGIFICATIONformng part of Letters PatentNo. 754,391, dated March 8, 1904.

, y applicano; nea November 26,1991. sesam. 83,713. g (Nomade.)

be placed upon doors of safes, bank-vaults, or.

other receptacles designed for storing valuables, so as to be-electrically operated vupon any movement being given to the draw-bolts of the door.

The object of this invention isl to provide a simple and efficient means for protecting vaultsafes or other receptacles, whereby any attempt' to o pen the door of the same by turning v thereof will close an electric circuity throughan automatlc contact-drop or circuit-closer,

the knob or handle operating the draw-bolts the momentary operation of said circuit-closer closing permanently a second electric circuit leading therefrom to any suitable electric alarm or signal.

Our invention consists generally in anovel circuit-closing attachment adapted to be placed on one or more of the draw-bolts ofv any safe or vault door or upon any other door and adapted to close an electric lcircuit upon the movement of the draw-bolt preparatory to opening' the door.

The invention consists, further, in the constructions and combinations hereinafter described,4 and claims. v f

In the accompanying drawings, Figure 1 is an elevation of the inside of a bank-vault or safe-door.. having our circuit-closing attachment thereon and in connection therewith a diagraraillustrating the electric circuits connected therewith, with an elevation of the automatic circuit-closer and an outline of the alarm-gong.v Fig. 2 is a sectional view of the draw-bolt and circuit-closing, attachment connected therewith. Fig. v3 is aside elevation of the device shown in' Fig. 2.-

. In the drawings, 1 represents theframe or casing of the vault or safe door, and 1" represents the door, having the usual draw-bolts2" particularly pointed out in the thereon. These bolts are arranged to be 'op-- erated by the usual turn-spindle and links or by'any suitable means. Secured upon-one of said bolts near its outerend is a ring ofy insulating material 3,*around which is placed an l open metallic collar-1:, having outwardly-extending ends 5. Aninsulating-block 61s" ar-v ranged between the ends 5 ofl the collar and extends beyond said ends. A screw 7 passes through `the ends 5, through. the insulatingblock and forms a support for an ordinary binding-post 8.v A' second binding-post 9l is secured upon the'insulating-block 6. .Secured beneath the binding-posts 8 and 9, respectively, are theI contact-springs 10 land 11, the free ends of which rest normally when the bolts are thrown to lock the door on a small insulatingplate 12, placed on the frame of the vault-door.

Atanysuitable point, preferably within-the vault, is placed a suitable battery 1.3 and a contact-drop or automatic circuit-closer 14.

The armature 15'of this circuit-closer is provided with a hook or catch' and supports the free end lof the pivoted arm 16', which is pressed downward by the small spring 17,

. Beneath the arm 16 is the contact-spring18,

which is notincontact with the arm 16 when v said arm is supported by the armature 15; but v when said arm is released by the armature it will be pressed downwardby the spring 17, so as to make an electricalv contact with the spring 18. The'spring 17 remaining in contact with. the arm- 16 and said arm beingin contact with the spring 18, a circuit will be closed through the spring 18, the arm 16, and the spring 17. A suitable conductor 19 extendsl from the binding-post 9 on the draw-bolt of the vault-door to the automatic circuit-closer 111 and is connectedto the magnet thereof. 1 A second conductor 2O extends from the magnet to the battery 13. Extending from the conductor 2O is the conductor 21, that isconnected to Vthespring '17. A conductor 22 alsoV extends from the binding-post 8 on the draw-bolt' of the vault-door to the other pole ofthe battery .13. From the battery and spring' 18 extend, re-

spectively, conductors 23 and 24'to/ an alarm or signal device 24:', which may be'of any suitable construction.

The operation of' the apparatus will he readily understood from lthe foregoing detailed description of its construction.

bolt is moved even a. very slight amount, the springs 104 and l1 will move'otl' from'theinsulating-block l2 and will come in contact with the metallic door-frame and an electric circuit will be closed through said springs, the door-frame, the battery. the conductors, and the magnet of the automatic circuit-closers or contact-drop. This will release the arml and permit it to dropdown oncontact-'spring 4*18, 'the' contact-spring 17 following said arm- -with ,the metallic dor'frame. it Will be obviand remaining in contact therewith. `By this means a `circuit will' be` closed throughthe alarm-gong, land said gong will be sounded until thebattery is exhausted or until the Vvault isentered. and the pivoted arm 16 is raised and secured by the hookv upon the armature As a very slight movementof, the drawv.

bolt will 'cause the springs to corne'in contact ous that if any attempt is made to move the drawbo1ts the 'circuit will be closed and the alarm will be sounded. l

Various' modifications of the apparatus will 'be apparent to any one skilled in theart, and

hence We do not confine ourselves to the de-l tails of the construction herein shown and described.

We do not in this application make claim to the general. burglar-alarm system with which thisV device maybe used,4 as We have shown 1f an)r attemptis made to open the door and the d rawl and described the samein a separate applicaan electric circuit upon the movement ot' said bolt, an automatic circuit-closer and an .alarmgong in a circuit arranged tobe closed by said automatic circuit-closer, substantially as" described. j

2. The combination, with a vault or vaultdoor provided with a draw-bolt '2; of an .in-

su'lated collar arranged upon vsaid draw-bolt, the contact-springs 1() and 11 supported upon said draw-bolt and vadapted to rest normally upon an insulating-block arranged upon the door-frame, an automatic circuitcloser in circuit With said contact-springs, an alarm-gong and an electric circuit connected therewith Vand adapted to be closed` by said automatic circuit-closer.V

In witness whereoi` we have hereunto set our hands this 9th day of Novem-ber, 1901.

FREEMAN C. ROBINSON. JAMES E. GREEN.

In presence of- 1. V. FLICKINGER, PAINTER KNOX. 

